Posts in 2023
  • Manage RDP certificates on Windows using SSH

    Friday, December 15, 2023 in Blog

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    Windows can use normal TLS certificates to authenticate RDP sessions. This gets rid of the annoying RDP certificate warnings: Using real, signed certificates for RDP offers a way to enhance security (preventing man-in-the-middle attacks) and reduce …

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  • Reviving a dead Gigabyte MJ11-EC1 mainboard

    Thursday, November 16, 2023 in Blog

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    Used Gigabyte MJ11-EC1 mainboards are available for low prices on ebay and at other hardware vendors. After buying a couple of MJ11-EC1 boards for a homelab cluster project, I ended up with a dead board. The server would turn on, BMC was reachable …

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Posts in 2021
  • PlutoSDR standalone ADS-B FR24 feeder

    Wednesday, December 01, 2021 in Blog

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    PlutoSDR (or ADALM-PLUTO) is an inexpensive SDR (software-defined radio) platform by Analog Devices. It uses a Xilinx Zynq Z-7010 FPGA, which integrates an 32bit ARMv7 core together with the FPGA functionality. This 32bit ARMv7 CPU runs Linux and is …

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Posts in 2020
  • Micro8088 build log

    Thursday, October 29, 2020 in Blog

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    Overview This is a build log of an IBM XT-compatible system called “Micro 8088”, designed by Sergey Kiselev. micro8088 CPU card specifications: NEC V20 CPU (4.77 MHz, 7.16 MHz and 9.54 MHz CPU frequencies) Faraday FE2010A chipset 640 KiB …

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  • OpenWRT als WireGuard-Appliance

    Sunday, June 21, 2020 in Blog

    OpenWRT ist eine ideale Grundlage um einen VPN-Endpunkt für das WireGuard-VPN-Protokoll aufzubauen. Die Software lässt sich auf verschiedensten Plattformen für die verschiedensten Anforderungen installieren. Es gibt OpenWRT-Images für viele Geräte, …

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Posts in 2019
  • GPS locked Raspberry Pi

    Sunday, June 23, 2019 in Blog

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    For highly-accurate timekeeping or signal generation with a Raspberry Pi, it’s possible to replace the on-board crystal with an external reference input. On the Raspberry Pi 1 the main system oscillator is a 19.2 MHz quarz crystal. In order to …

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  • Es'hail-2 transceiver setup

    Saturday, April 27, 2019 in Blog

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    QO-100, also known as Es’hail-2 is a geostationary amateur radio satellite. It can be used by large parts of the world, including Europe, Africa, (parts of) South America and Asia. The satellite works as a linear transponder. It receives a …

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  • ThinkPad PowerSeries 820

    Tuesday, April 23, 2019 in Blog

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    One of the rarest ThinkPads is the ThinkPad PowerSeries 820, running a Power PC 603e at 100 MHz. It’s code name is Wiltwick, the type designator (used in Windows) is 6040. It uses an 800x600 TFT, WD90C24A/G10 graphics and has a 1.2 GB SCSI HDD. …

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  • PlutoSDR clock input

    Saturday, January 05, 2019 in Blog

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    Warning! This modification voids the warranty and can operate the transceiver outside of it’s absolute maximum ratings! The PlutoSDR has an internal XO (Rakon RXO3225M 40.000 MHz), which has excellent qualities like very low jitter. …

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Posts in 2018
  • WiFi over satellite TV coax

    Sunday, October 14, 2018 in Blog

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    There’s a number of different ways to distribute an ethernet signal throughout a building. The most common types being: twisted pair wiring fiber optic cable WiFi (2.4 GHz, 5GHz) powerline (also called PLC, IEEE 1901) In my application, running …

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